The BlackRapid Wrist Camera Strap is made of nylon and features a brass/zinc carabiner. A separately sold BlackRapid FastenR, which is a D-ring with a 1/4"-20 screw, can be secured to the carabiner to allow direct camera attachment. A plastic carabiner protector is included with the wrist strap to help prevent the carabiner from accidentally unlocking or from scratching your camera.